org.sqlite.ProgressHandler Maven / Gradle / Ivy
package org.sqlite;
import java.sql.Connection;
import java.sql.SQLException;
/** https://www.sqlite.org/c3ref/progress_handler.html */
public abstract class ProgressHandler {
/**
* Sets a progress handler for the connection.
*
* @param conn the SQLite connection
* @param vmCalls the approximate number of virtual machine instructions that are evaluated
* between successive invocations of the progressHandler
* @param progressHandler the progressHandler
* @throws SQLException
*/
public static final void setHandler(
Connection conn, int vmCalls, ProgressHandler progressHandler) throws SQLException {
if (!(conn instanceof SQLiteConnection)) {
throw new SQLException("connection must be to an SQLite db");
}
if (conn.isClosed()) {
throw new SQLException("connection closed");
}
SQLiteConnection sqliteConnection = (SQLiteConnection) conn;
sqliteConnection.getDatabase().register_progress_handler(vmCalls, progressHandler);
}
/**
* Clears any progress handler registered with the connection.
*
* @param conn the SQLite connection
* @throws SQLException
*/
public static final void clearHandler(Connection conn) throws SQLException {
SQLiteConnection sqliteConnection = (SQLiteConnection) conn;
sqliteConnection.getDatabase().clear_progress_handler();
}
protected abstract int progress() throws SQLException;
}